Armature.



Patented Sept. 8, 1914.

2 SHEETS-SHBET 1..

*E2/767%? M Wyo.

C. W. DAKE.

ARMATURE.

APPLICATION TILED APE. 25, 1913.

C. W. DAKE.

ARMATURE.

APPLIOATION FILED APB. 25, 1913.

Patented sept. s, 1914.

2 SHEETS-SHEET 2.

m. *mw y@ /lll UNITED sTATEs PATENT oEEroE.

CHARLES W. DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR TO PYLE-NATIONAL ELECTRIC HEADLIGHT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 0F NEW JERSEY.

ARMATURE.

Specification of Letters latent.

Application tiled April 25, 1913.

,Patented sept. s, 1914.

Serial No. 763,510.

Figure 1 is a section; Fig. Q a detail section through the hub; Fig, 3 is an end elevation of the commutator; Fig. 4 is a side elevation 0f the commutator with parts broken away; Fig. 5 is a plan View of and Fig. 6 is asection through the insulating collar interposed between the commutator and the hub; Fig. 7 is a plan view of and.

Fig. 8 is a section through the insulating collar interposed between the commutator and the holding washer.

Like parts are indicated by the same letters throughout the several figures.

The shaft A is mounted in a bearing A1 supported by the bracket A2 and the housing sleeve A3 and lubricated by the oiling ring A4. v

A5 is a housing rigidly attached to the end of the bearing supported by the footAG.

A7 isan oil fiange or a guard projecting inwardly into the housing A5 from the end of the sleeve 'Aix and adapted to serve as a shield for the end of the bearing to prevent the discharge of oil into the housing A".

B` B1 are field coils located within the housing A5 and adapted to excitethe field magnets B1, B3 located'concentrically with the shaft A.

B1 is-a cap closing the outer side of the housing A5 and protecting the end of the shaft A and associated p'arts.

C is a hub slidable on the end of the shaft A provided with a conical portion C1 in parallelism with the tapered end C2 of the Shaft A.

C3 is a sleeve extending outwardly from the smaller end of the conical portion C1 of' the hub C.

C4 is a spider mounted on the hub C.

C5, C5 are armature coils supported on the spider.

C6 is a cap screw screw-threaded in the end of the shaft A and bearing against the end of the sleeve C, adapted `when tightened to draw the hub C onto the end of the shaft and clamp the conical portion C1- of the huh against the tapered end C2 of the shaft, thus centering the hub upon the shaft independent of the relation between the cylindrical portion of the hub and the shaft.

I) is a commutator made up of the tapered commutator segments D1, D1 having the inclined inner surface Dzin engagement with the inclined surface D on the hub and provided with angular fingers D* engaging the insulating ring D5 backed against the undercut flange D on the hub C.

D1, D7 are insulated mica sheets interposed between the commutator segments D1, D1.

Ds is lan undercut collar or sleeve slidable on the sleeve C3 having interposed between it and the fingers D9 the commutator segments D1 and the insulating collar D10.

D is a nut screw-threaded on the sleeve C3 adapted to be rotated to force the collar Ds against the commutator segments, thus locking them between the Vtwo undercut sleeves D6 and D8 and thus centering them upon the hub.

E is the cylindrical contact portion of the commutator.

E1, lE1 are brushes mounted in the lbrush holders E1 and in engagement with the cy. lindrical portion of the commutator El .E3 are lugs outwardly projecting from the commutator segments-slotted at E4 to make.

electrical contact with the armature windings not shown.

Itwill be evident that while I have shown this device as applied toan armature, still it is quite conceivable that it might be applied to other types of electrical equipment or even, without changing the subject matter of niv invention, to machine-ry not necessarily electrical, but for the purpose of convenience I have illustrated it as applied to an armature of an electrical machine.

The use and operation of my invention are as follows: The device is assembled by First holding or otherwise attaching the armature housing to thesupporting sleeve and' then inserting the shaft in the bearing in the sleeve so that it projects into the armature housing as indicated, the field magnets, coils and connections being placed in the usual manner. The commutatorV segments will then be adjusted upon the hub, being separated from the hub by the insulated collars as indicated and from each other by the usual mica strips as indicated. The tightening up of the nut on the sleeve-like reduced end of the hub will firmly clamp all the commutator segments together -in position with respect to the hub, and owing to the conical shape of the clamping surface will inevitably center the commutator segments, which will be held firm in position by the overhanging portions of the sleeves which overlie the inclined surface fingers on the segments. The armature coils will leV positioned on the spider and hub in the usual manner and connected to the commutator Segments in the usual manner, preferably, of course, byupsetting the terminal wires which in the meanwhile have been placed in the slots shown -as part of the commutator segments. The assembled armature will then be placed on the shaft and when the cap screw is tightened up the hub will be centered on the shaft by means of the contact between the conical portion thereof and the tapered end of the shaft. It will be noted that by this arrangement the shaft does not need to pass clear through the hub and commutator, and that, therefore, the hub may be reduced in diameter, thus permitting a very material reduction in the diameter of the commutator, which reduction -of course leads to much more satisfactory commutator arrangement owing to lower peripheral speeds, thus decreasing the tendency toward chattering, sparking, wearing away of the brushes and segments and the like. The guard flange as indicated, of course prevents the discharge of oil from the bearing into the armature housing, thus protecting lthe insulation against damage by the oil.

I claim:

1. A support for a commutator comprising a tapered hub, an undercut flange located at the larger portion of said hub, a sleeve projecting outwardly from the smaller portion of said hub and an undercut collar slidable on said sleeve in opposition to said flange, and means for forcing said collar toward said .flange and holding it in position.

2. A commutator comprising a tapered hub, an undercut flange about the larger portion of said hub, commutator bars grouped about said hub having outwardly eX- Vtending fingers underlying the undercut flange, a cylindrical extension projecting outwardly from the small end of said hub, fingers on said commutator bars beneath the working surfaces thereof, a collar slidable on said sleeve and undercut to overlie said fingers, and means for forcing said collar against said lingers.

3. A hub for electric armatures and the like having a truncated conical portion, an undercut flange about the larger portion of said cone, commutator segments peripherally arranged about said truncated conical portion'having inclined fingers projecting under said undercut flange, a cylindrical extension projecting outwardly from the upper smaller end of said truncated conical portion and a collar having an undercut portion slidable upon said sleeve and overlying fingers on said commutator segments and means for drawing said collar and said flange together to clamp said commutator segments.

4. A rotor for electric machines comprising an armature and commutator hub, a

.shaft upon which said hub is mounted, a

longitudinally together to center the end the hub on the shaft.

1n testimony whereof, I-aflix my signature in the presence of two witnesses this 18th day of April, 1913.

CHARLES W. DAK E.

Witnesses:

MINNIE SUNDFAR, MINNIE M. LINDENAU.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

